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March 31, 2015

March 31, 2015

Posted by **Jon** on Saturday, February 9, 2008 at 1:39pm.

Age 15-34 number of people= 265,778

Age 35-54 number of people= 308,946

Age 55-74 number of people= 159,092

Age over 74 number of people= 69,264

1)Classify the data in the table.

A)positively skewed

B)negatively skewed

C)normally distributed

D)discrete distribution

My first choice was C but I went with A instead.

2)For 2000 patients, a blood-clotting time was normally distributed with a mean of 8 seconds. What percent had blood-clotting times between 5 and 11 seconds?

A)68%

B)34%

C)49/5%

D)47/5%

I chose A

3)During a sale, 1/6 of the CD prices are reduced. Find the probability that 2 of 4 randomly-selected CDs have reduced prices?

A)5/36

B)25/1296

C)25/216

D)5/216

I dont know

4)A music teacher wants to determine the music performances of students. A survey of which group would produce a random sample?

A)students in the school band

B)students attendeing the annual jazz concert

C)students in every odd-numbered homeroom

D)every other player on the baseball roster

I chose B

5)In an election poll, 56% of 400 voters chose a certain canidate. Find the margin of sampling error.

A)5%

B)2%

C)4%

D)7%

I chose A

- math -
**PsyDAG**, Saturday, February 9, 2008 at 2:22pm1) sounds fine.

2) How can you determine the percentages without knowing the Standard Deviation? You need a measure of variability.

3) The probability of picking a reduced DC is 1/6, not reduced = 5/6. The probability of picking 2 of each is 1/6 * 1/6 * 5/6 * 5/6 (multiply).

4) A random sample means that*every*student has an equal probability of being in the sample. Reconsider your answer.

5) Right.

I hope this helps. Thanks for asking.

- math(correction) -
**Jon**, Saturday, February 9, 2008 at 3:01pmI'm sorry #2 says For 2000 patients, a blood-clotting time was normally distributed with a mean of 8 seconds and a standard deviation of 3 seconds. What percent had blood-clotting times between 5 and 11 seconds?

Is #4 A?

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